Umbonium costatum (Valenciennes)
| 1928. | Umbonium costatum (Valenciennes) |
| Condition: | Present |
| Taxonomy: | Mollusca: Gastropoda: Trochidae: |
| Geologic Time: | Cenozoic: |
| Yokoyama, M., 1928b: Neogene shells from the oil-field of Higashiyama, Echigo. Journal of the Faculty of Science, Imperial University of Tokyo, Section 2, vol. 2, pt. 7, pp. 351–362, pls. 68–69. (Reference No. 0495) |
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| Ichikawa, T., 1983, no. 9, p. 376. |
